我编写了一个 C# 渲染方法,将热图渲染到 Grasshopper Canvas 上。 Grasshopper 是一个 Rhino 插件,允许使用简单的 GUI 编程界面。
protected override void Render(Grasshopper.GUI.Canvas.GH_Canvas canvas, Graphics graphics, Grasshopper.GUI.Canvas.GH_CanvasChannel channel) {
base.Render(canvas, graphics, channel);
if (channel == Grasshopper.GUI.Canvas.GH_CanvasChannel.Wires) {
var comp = Owner as KT_HeatmapComponent;
if (comp == null)
return;
List<HeatMap> maps = comp.CachedHeatmaps;
if (maps == null)
return;
if (maps.Count == 0)
return;
int x = Convert.ToInt32(Bounds.X + Bounds.Width / 2);
int y = Convert.ToInt32(Bounds.Bottom + 10);
for (int i = 0; i < maps.Count; i++) {
Bitmap image = maps[i].Image;
if (image == null)
continue;
Rectangle mapBounds = new Rectangle(x, y, maps[i].Width, maps[i].Height);
//Rectangle mapBounds = new Rectangle(x, y, maps[i].Width * 10, maps[i].Height * 10);
mapBounds.X -= mapBounds.Width / 2;
Rectangle edgeBounds = mapBounds;
edgeBounds.Inflate(4, 4);
GH_Capsule capsule = GH_Capsule.CreateCapsule(edgeBounds, GH_Palette.Normal);
capsule.Render(graphics, Selected, false, false);
capsule.Dispose();
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Half;
graphics.DrawImage(image, mapBounds);
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.Default;
graphics.DrawRectangle(Pens.Black, mapBounds);
y = edgeBounds.Bottom - (mapBounds.Height) - 4;
}
}
}
目前,此渲染方法将这样的图像绘制到 Canvas 上:
话虽如此,我想在顶部放置一些标题文本,并在 X 轴和 Y 轴上放置标签,就像标准热图一样。但是,我对graphics
组件的理解太有限了,还望各位大侠指点迷津。
我做了一些研究,似乎 drawText()
方法可以做我想做的事:c# write text on bitmap
但我不确定在哪里指定坐标,同时在显示的图表顶部留出一些空间来放置标题文本。
最佳答案
GDI+ 使用的坐标系从左上角开始,即 (0,0) 右下角(fullimagewidth,fullimageheight)
所以如果你需要在图像的左上角使用
//Position
PointF drawPoint = new PointF(0F, 0F);
// Draw string to screen.
e.Graphics.DrawString("hey", drawFont, drawBrush, drawPoint);
关于c# - 在 C# 图形位图中放置文本坐标的位置,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20998413/